patch 8.1.1922: in diff mode global operations can be very slowv8.1.1922

Problem:    In diff mode global operations can be very slow.
Solution:   Do not call diff_redraw() many times, call it once when redrawing.
            And also don't update folds multiple times.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/fold.c b/src/fold.c
index 482d3c968..6200578fc 100644
--- a/src/fold.c
+++ b/src/fold.c
@@ -813,6 +813,11 @@ foldUpdate(win_T *wp, linenr_T top, linenr_T bot)
 
     if (disable_fold_update > 0)
 	return;
+#ifdef FEAT_DIFF
+    if (need_diff_redraw)
+	// will update later
+	return;
+#endif
 
     /* Mark all folds from top to bot as maybe-small. */
     (void)foldFind(&wp->w_folds, top, &fp);